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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Statement of Comprehensive Income [Abstract]    
Net income $ 1,001 $ 743
Other comprehensive loss, net of tax    
Net unrealized loss from derivative instruments (net of taxes of $56 and $3, respectively) (199) (7)
Reclassification into earnings of net derivative instruments loss (gain) to net income (net of taxes of $(6) and $1, respectively) 20 (5)
Benefit plan adjustments (net of taxes of $1 and $—, respectively) (3) (2)
Total other comprehensive loss (182) (14)
Comprehensive income 819 729
Comprehensive income attributable to noncontrolling interests (25) (26)
Comprehensive income attributable to KMI $ 794 $ 703